All Speed, All Conditions The Fastest XC Race Tire for Varied Conditions. Experience unmatched speed, control, and efficiency in mixed terrain with Fast Trak - the ultimate go - to tire for high - performance XC riding and racing. Its optimized tread design and reduced knob height cut weight by 55g and improve rolling resistance by 5% , delivering faster acceleration, superior handling, and peak performance in any condition. At a Glance Use XC racing and riding Tread Compact center knobs, Block-In-Block outer knobs Compound GRIPTON dual T5/T7 compound for speed on straights and corners Casing 60TPI Flex Lite for speed Type Tubeless Approximate Weight 29x2.2, 605g29x2.35, 615g